Ex working girl here. The reviews and the sad fuckers, sorry hobbyists, who used to discuss working girls obsessively on sites like punternet were the bane of my life.
It's all about exercising some kind of control over the women IMO. They know that writing a negative review can have a serious impact on someone's earnings as most punters check out the reviews before booking, and they love the power it gives them.
I always felt that it was as if they felt diminished by handing over the money and they wanted to try to take that power back by writing about the woman online and affecting her business for better or worse.
If you ever read any punter forums, you'll notice that they have enormous resentment towards these women who they're so obsessed with. They absolutely hate the women making a decent living from what they do and think they should all be charging what prostitutes in developing countries charge. So if a sexual service is available in thailand for £15 then they believe they are being ripped off if an escort in London wants £150 for her time.
No respect whatsoever for the working girls, huge resentment towards them and yet total obsession with them. It's a weird world, the world of punting forums.
I should be referring to all of this in the past tense as my experiences are from a few years ago now but I find it hard to believe that any of it has changed much 